I usually carry a lever gun with a light cast bullet in the chamber and some sort of jacketed expanding bullets in the magazine. Carrying my .44 mag I had two grouse come in out of nowhere, first one got the lead, the second one got a 180 gr JHP and became a 2 foot mass in the snow. Basically gutted the bird and left me with the boneless breasts attached to the neck and head with a few feathers over the meat. Not a bad result, but I won't try that again.
This season I was carrying my 1895CB in 45-70, I took a squirrel with a 340 gr cast bullet at about 1200 fps. He was sitting at the base of a 16 inch pine tree, I found him around the side and about 3 feet from where I shot him. Bullet exited the other side of the tree. Was all edible save one front leg. Fried all the squirrel parts in bacon grease.... YUM!!!